If you are using Data Capture, for each site configured with Data Capture you must set the underlying application pool's Idle Time-out (minutes) property.
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On the application server, log in as a user with administrative rights, and open the Control Panel.
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Click Administrative Tools > Internet Information Services.
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Expand the web server node in the tree view.
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Select Applications Pools.
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Right-click application pool that has the same name as your Data Capture site, and select Set Application Pool Defaults.
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In the Application Pool Defaults dialog box, set the value for the Idle Time-out (minutes) property to 0 for large worker processes.
For small worker processes, the recommended value for the Idle Time-out (minutes) property is 20.
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Click OK.
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Right-click the application pool, and select Recycle.